282471 The correct formula used to decide the focal length of a lens is ( \(F\) is focal length, \(\mu\) is refractive index of the material of lens, \(R_1\) and \(R_2\) are radii of curvature of curved surfaces, \(u\) and \(v\) are respectively object distance and image distance

282472 In experiment of finding the focal length of a convex lens by two- pin method, the \(u-v\) graph obtained by the student will be as

(a)
(b)
(c)
(d)
Ans: c
Exp: C: When, \(\mathrm{u}=\mathrm{f}\) then \(\mathrm{v} \rightarrow \infty\) and \(\mathrm{u}=\infty, \mathrm{v}=\mathrm{f}\)

282473 A person cannot see objects clearly beyond 50 \(\mathrm{cm}\). The power of the lens to correct the vision is

282474 The focal length of a simple convex lens used as a magnifier is \(10 \mathrm{~cm}\). For the image to be formed at a distance of distinct vision \((D=25\) \(\mathrm{cm}\) ), the object must be placed away from the lens at a distance of

282471 The correct formula used to decide the focal length of a lens is ( \(F\) is focal length, \(\mu\) is refractive index of the material of lens, \(R_1\) and \(R_2\) are radii of curvature of curved surfaces, \(u\) and \(v\) are respectively object distance and image distance

282472 In experiment of finding the focal length of a convex lens by two- pin method, the \(u-v\) graph obtained by the student will be as

(a)
(b)
(c)
(d)
Ans: c
Exp: C: When, \(\mathrm{u}=\mathrm{f}\) then \(\mathrm{v} \rightarrow \infty\) and \(\mathrm{u}=\infty, \mathrm{v}=\mathrm{f}\)

282473 A person cannot see objects clearly beyond 50 \(\mathrm{cm}\). The power of the lens to correct the vision is

282474 The focal length of a simple convex lens used as a magnifier is \(10 \mathrm{~cm}\). For the image to be formed at a distance of distinct vision \((D=25\) \(\mathrm{cm}\) ), the object must be placed away from the lens at a distance of

282471 The correct formula used to decide the focal length of a lens is ( \(F\) is focal length, \(\mu\) is refractive index of the material of lens, \(R_1\) and \(R_2\) are radii of curvature of curved surfaces, \(u\) and \(v\) are respectively object distance and image distance

282472 In experiment of finding the focal length of a convex lens by two- pin method, the \(u-v\) graph obtained by the student will be as

(a)
(b)
(c)
(d)
Ans: c
Exp: C: When, \(\mathrm{u}=\mathrm{f}\) then \(\mathrm{v} \rightarrow \infty\) and \(\mathrm{u}=\infty, \mathrm{v}=\mathrm{f}\)

282473 A person cannot see objects clearly beyond 50 \(\mathrm{cm}\). The power of the lens to correct the vision is

282474 The focal length of a simple convex lens used as a magnifier is \(10 \mathrm{~cm}\). For the image to be formed at a distance of distinct vision \((D=25\) \(\mathrm{cm}\) ), the object must be placed away from the lens at a distance of

282471 The correct formula used to decide the focal length of a lens is ( \(F\) is focal length, \(\mu\) is refractive index of the material of lens, \(R_1\) and \(R_2\) are radii of curvature of curved surfaces, \(u\) and \(v\) are respectively object distance and image distance

282472 In experiment of finding the focal length of a convex lens by two- pin method, the \(u-v\) graph obtained by the student will be as

(a)
(b)
(c)
(d)
Ans: c
Exp: C: When, \(\mathrm{u}=\mathrm{f}\) then \(\mathrm{v} \rightarrow \infty\) and \(\mathrm{u}=\infty, \mathrm{v}=\mathrm{f}\)

282473 A person cannot see objects clearly beyond 50 \(\mathrm{cm}\). The power of the lens to correct the vision is

282474 The focal length of a simple convex lens used as a magnifier is \(10 \mathrm{~cm}\). For the image to be formed at a distance of distinct vision \((D=25\) \(\mathrm{cm}\) ), the object must be placed away from the lens at a distance of